Sub cycling help

I built a 300blk using ballistic advantage barrel 9 inch 1/7. Twist pistol length gas system. I used a SA .750 adjustable gas block (opened all the way up) areo upper and lower. SBPDW adjustable brace with tube and buffer. Microbest 158 CS chrome-lined BCG, Lahar suppresser. Runs Ammo Inc Stealth no issues. Won’t cycle Hornady 190 grain Subsonic. Any tips?